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 ###Instrução: Quantos estados tinham uma densidade populacional de 10188.8?
 ###Tabelas: CREATE TABLE 1973_to_1983 (1973_to_1983_id AUTO_INCREMENT PRIMARY KEY, Issued VARCHAR, Type VARCHAR, Design VARCHAR, Serial format VARCHAR, Serials issued VARCHAR) CREATE TABLE incorporated_places_with_a_density_of_over_10000_people_per_square_mile (incorporated_places_with_a_density_of_over_10000_people_per_square_mile_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Incorporated place VARCHAR, Metropolitan area VARCHAR, State VARCHAR, Population (2010 census) INT, Land area (mi 2 ) VARCHAR, Population density (people per mi 2 ) VARCHAR) CREATE TABLE listing (listing_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Name VARCHAR, Population ( 2011 Census ) INT, Percent of national population VARCHAR, % growth (2006–11) VARCHAR, Land area (km²) INT, Population density (/km 2 ) INT, House of Commons seats INT, House of Commons seats (%) VARCHAR, 2013 population (July est.) INT) CREATE TABLE episode_events (episode_events_id AUTO_INCREMENT PRIMARY KEY, Episode Number INT, Air Date VARCHAR, Event 1 VARCHAR, Event 2 VARCHAR, Event 3 VARCHAR, Event 4 VARCHAR) CREATE TABLE siena_college_research_institute_survey (siena_college_research_institute_survey_id AUTO_INCREMENT PRIMARY KEY, Seq. VARCHAR, Name VARCHAR, Background INT, Party Leadership INT, Communication Ability INT, Relations with Congress INT, Court Appointments INT, Handling of Economy INT, Luck INT, Ability to Compromise INT, Willing to take Risks INT, Executive Appointments INT, Overall Ability INT, Imagination INT, Domestic Accomplishments INT, Integrity INT, Executive Ability INT, Foreign Policy Accomplishments INT, Leadership Ability INT, Intelligence INT, Avoid Crucial Mistakes INT, Expert's View INT, Overall INT)  
SELECT COUNT State FROM incorporated_places_with_a_density_of_over_10000_people_per_square_mile WHERE Population density (people per mi 2 ) = 10188.8